CN102545292B - One-line communication point-to-point type single lithium ion battery management system based on system on chip - Google Patents
One-line communication point-to-point type single lithium ion battery management system based on system on chip Download PDFInfo
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Abstract
A peer-to-peer monomer lithium ion battery management system on basis of 1-wire communication of an on-chip system is suitable for building the peer-to-peer general lithium ion battery management system with large volume and large power source for electric cars and electric bicycles, and adopts a fifth generation of integrated circuit, namely the on-chip system, to monitor and manage the monomer lithium ion battery through a 1-wire communication bus. A network system capable of reinforcing the monomer lithium ion battery management is built in forms of physical network series and physical network parallel, so that the whole battery management system has characters of structuration, modularization, simplification, and practicability.
Description
Art
The invention relates to electric bicycle and power battery device of electric vehicle, be especially applicable to forming high power capacity, powerful power source by lithium ion battery.
Background technology
Along with the development in lithium ion battery market, battery management system becomes and becomes increasingly complex and variation, substantially can be divided into: tailored version and universal two fields.
The limited amount of the lithium ion battery of tailored version battery management system management, be applicable to the management system of mobile phone, notebook computer, digital camera and portable compact electric apparatus small-scale lithium ion cell used, be not suitable for electric bicycle and the large-scale lithium ion battery management system of electric automobile.
General battery management system generally adopts layering or distributed architecture, all do not relate to the management and supervision to monomer lithium ion battery, because the chemical characteristic of lithium ion battery is along with service time, the change of environment for use and changing, so its internal resistance and capacity also can make corresponding change, data sampling unit to monomer lithium ion battery apart from too far away, impedance will be produced, parasitic capacitance, stray inductance, unfavorable to the estimation of the equilibrium between battery and battery capacity, affect the performance and used life of lithium ion battery, such as, on June 7th, 2006 is open and mandate by the People's Republic of China (PRC), the patent No. is 200410081434.5 and is called that the technical scheme of " distributed battery management system and management method " also just speaks of the data sampling to two batteries, universal battery management system adopts CAN as communication bus mostly, CAN is not the communication bus of battery management system bus but automotive electronics, both is distinguishing, it is very inadequate that its communications protocol and electrical characteristic are used in battery management system, such as, on December 8th, 2004 is open and mandate by the People's Republic of China (PRC), the patent No. is 200310111599.8 and is called " a kind of battery management system multilayer distributed based on CAN ", on December 22nd, 2004 is open and mandate by the People's Republic of China (PRC), the patent No. is 200410013807.5 and is called the open and mandate by the People's Republic of China (PRC) of " a kind of power battery management system for electric automobile " and on December 31st, 2008, the patent No. is 200810021154.3 and is called that the technical scheme of " distributed battery management system and management method thereof " is all adopt CAN, CAN is two connections, connection quantity is too many, add higher slice too many, so battery management system will become intricate, affect whole network speed, and the communication network of battery management system and the communication network of automotive electronics are in same network topology, two network systems are not kept apart, greatly reduce the antijamming capability of battery management system, and the central processing unit of above-mentioned four art solutions all adopts forth generation integrated circuit (microprocessor) to design, peripheral circuit is complicated, the volume of control circuit is caused to increase, do not meet with the body structure of monomer lithium ion battery, cannot monitor monomer lithium ion battery, management, present integrated circuit developed into for the 5th generation, i.e. SOC (system on a chip), thus, the design concept of present general battery management system is out-of-date, the developing direction of battery management system can not be represented.
Summary of the invention
The object of the invention is to abandon the design concept that out-of-date forth generation integrated circuit (microprocessor) is central processing unit, forgoing inappropriate take CAN as the lithium ion battery network system of core, innovation minimum unit is with the management mode of two or more lithium ion battery, utilize SOC (system on a chip) small size, high-performance and one-line communication bus simple, practical technical advantage, simplify the network configuration of lithium ion battery management system, set up the point-to-point network system of lithium ion battery management system with cutting the garment according to the figure, accelerate the transmission speed of network data, build stable lithium ion battery management system module, to be connected by asynchronous serial communication point-to-point between monomer lithium ion battery with Li-ion batteries piles and between Li-ion batteries piles with lithium ion battery case, point-to-point synchronous serial communication is connected, realize directly managing monomer lithium ion battery, adopt the advantage of monomer lithium ion battery and Li-ion batteries piles its voltage, realize the communication network of battery management system inside and the communication network isolation of outside automotive electronics, reduce the interference of battery management system network internal, the control dynamics of monomer lithium ion battery and Li-ion batteries piles is strengthened greatly, give full play to the performance of monomer lithium ion battery, extend the useful life of monomer lithium ion battery, thus improve the integral level of power source.
The object of the invention is to be reached by the measure of the hardware designs of lithium ion battery management system, Software for Design, Anti-Jamming Technique three aspects:
A SOC (system on a chip) is loaded in monomer lithium ion battery data acquisition unit, then an entirety is packaged into, according to the technical requirement of electric automobile, Module Division on hardware is carried out to monomer lithium ion battery, monomer lithium ion battery data acquisition unit utilizes monomer lithium ion own power source to power, Li-ion batteries piles is formed by multiple monomer lithium ion battery, Li-ion batteries piles is applicable to the power source being used as electric bicycle, the lithium ion battery case be made up of multiple Li-ion batteries piles is applicable to doing the power source of electric automobile, each monomer lithium ion battery is fixed on the base plate of Li-ion batteries piles, the data acquisition unit of monomer lithium ion battery carries out point-to-point asynchronous serial communication by the control board of one-line communication bus and Li-ion batteries piles, each Li-ion batteries piles control board respectively carries an one-line communication bus, point-to-point synchronous serial communication is carried out with the master control borad of lithium ion battery case, the data acquisition board of monomer lithium ion battery, the control board of Li-ion batteries piles, the master control borad of lithium ion battery case is made up of a SOC (system on a chip) respectively, according to each stage of microelectric technique development, also can be made up of a SOC (system on a chip) and simple peripheral circuit, the control board of monomer lithium ion battery data acquisition board and Li-ion batteries piles, transfer of data between the control board of Li-ion batteries piles and the master control borad of lithium ion battery case carries out Phototube Coupling by high speed photo coupling, filling of the master control borad of lithium ion battery case, the control board of electric discharge interface and Li-ion batteries piles fills, electric discharge interface is connected, Li-ion batteries piles is filled, electric discharge, Li-ion batteries piles control board fills, electric discharge interface filling by Li-ion batteries piles base plate, discharge circuit fills monomer lithium ion battery, electric discharge, the overall dimension of SOC (system on a chip), the structure of performance and simple peripheral circuit all can be different, the technical parameter in reference driving force source, X86 series can be selected according to the cost performance of SOC (system on a chip) and overall dimension, ARM series, MIPS series, the SOC (system on a chip) of SPARC series is as monomer lithium ion data acquisition unit, the central processing unit of Li-ion batteries piles control board and lithium ion battery case master control borad.The monomer lithium ion battery of Li-ion batteries piles and the Li-ion batteries piles of lithium ion battery case are all the connections being undertaken mechanically by the form of series and parallel.The functional structure of lithium ion battery management system is divided into groups, jointly realized by monomer lithium ion data sampling unit and Li-ion batteries piles control board, monomer lithium ion data sampling unit bears the balance between battery, voltage measurement, temperature survey, point-to-point asynchronous serial communication, Li-ion batteries piles control board bears overcurrent protection, short-circuit protection, overvoltage protection, low-voltage variation, reverse-voltage protection, high temperature protection, low-temperature protection, battery remaining power is estimated, point-to-point synchronous serial communication, lithium ion battery case master control borad bears the monitoring to each Li-ion batteries piles, management and the exchanges data with outside.
Basic parameter based on SOC (system on a chip) one line point-to-point type monomer lithium ion battery management system is as follows:
| Parameter | Maximum | Normally | Minimum | Unit | Annotation |
| Voltage | 5.5 | 2.7 | V | Operating voltage | |
| Electric current | 100 | 25 | mA | Operating current | |
| Temperature | 85 | -40 | ℃ | Working temperature | |
| Humidity | 90 | 10 | ％ | Working relative humidity | |
| Resistance | 39 | 30 | 1 | kΩ | Pull-up resistor |
| One-line bus | 4000 | 30 | KHZ | One linear velocity | |
| A/D reference voltage | 5.5 | 1.8 | 2.4 | V | A/D reference voltage |
| A/D operating voltage | 5.5 | 2.4 | V | A/D operating voltage |
Carry out the grouping on hardware to monomer lithium ion battery, concrete computing formula is as follows:
M is monomer lithium ion battery series connection number N is monomer lithium ion battery number in parallel
X is Li-ion batteries piles series connection number Y is Li-ion batteries piles number in parallel
M=electric bicycle power source voltage ÷ monomer lithium ion battery voltage
N=electric bicycle power source capacity ÷ monomer lithium ion battery capacity
X=electric powered motor source voltage ÷ Li-ion batteries piles voltage
Y=electric powered motor source capacity ÷ lithium ion battery pool-size
Software of the present invention is based on monomer lithium ion battery residual capacity and monomer lithium ion battery voltage, monomer lithium ion battery electric current, between monomer lithium ion battery temperature three, correlation realizes lithium ion battery management system functional requirement, thus the quantitative relationship of clear and definite outside batteries electrical characteristic and internal state, according to the voltage of monomer lithium ion battery, electric current, temperature external variograph calculates battery remaining power, internal resistance, the internal states such as electromotive force, battery remaining power is the important parameter in battery management system, for administering and maintaining of battery pack provides important evidence.Monomer lithium ion battery residual capacity is the direct reaction of whole lithium ion battery case electricity, grasp the every state information of monomer lithium ion battery timely and accurately, for safety management system provides important parameter, when abnormality occurs, send alarm signal or open circuit prevents contingency from occurring.Battery remaining power is defined as follows:
Monomer lithium ion battery residual capacity=(Qt/Q0) 100%
Wherein, Qt is that battery is in the residual capacity calculating the moment
Q0 is that battery is in the total capacity calculating the moment
Therefore, the Survey Software based on voltage, electric current, temperature, battery remaining power reasonable in design is very important to whole lithium ion battery management system.
In order to prevent the interference of battery management system, the reliability of raising system and accuracy, when the Hardware Design, adopt following Anti-Jamming Technique: the SMD components that the selection up-sampling Electro Magnetic Compatibility of element is good, because element pasted on surface has the feature of low parasitic parameter, resistance is selected to pay the utmost attention to Chip-R, for the resistance having pin, answer first-selected fixed carbon resister, next is metalfilmresistor, it is finally wire resistor, for the circuit of pullup/pulldown resistance, all inclined value resistance is all as far as possible near active device, and its VDD-to-VSS, thus reduce the inductance of circuit board line.Electric capacity of a great variety, different properties, selects suitable electric capacity can solve many electromagnetic compatibility problem, and native system mainly uses shunt capacitance and decoupling capacitor two kinds of technology.The major function of shunt capacitance is that generation one exchanges along separate routes, eliminates and enters those unwanted energy of area of liability, select alminium electrolytic condenser as shunt capacitance.The high frequency switching noise that SOC (system on a chip) active device produces when switch, to propagate along power line, the major function of decoupling capacitor is just to provide the DC power supply of a local to active device, fall down to the ground to reduce switching noise propagation onboard and noise is guided, select ceramic condenser as decoupling capacitor, as far as possible near each integrated package when decoupling capacitor is arranged.Except the selection of components and parts and circuit design, it is also a very important factor that good printed circuit board (PCB) (PCB) is routed in anti_disturbances technique, here following technology is adopted: the decoupling between locally supplied power source and integrated circuit: local decoupling can reduce the importing into of noise along electrical mains, Large Copacity shunt capacitance is got involved between power inlet and printed circuit board (PCB) (PCB), as a low frequency pulsating filter, simultaneously as an electromotive force accumulator, to meet the demand of burst power, decoupling capacitor is accessed between the VDD-to-VSS of each integrated circuit, in order to the switching noise of filtering integrated circuit.Native system uses doubling plate, and digitally wiring adopts grid, effectively reduces impedance ground, and the board area of not using is covered by a large ground plane, provides shielding and increase decoupling ability with this.Because native system adopts battery powered multiple power supply, so adopt grounding technology each isolated from power to be come.The wiring technique of local adopts and suitably adopts via hole, adopts miter angle during rotation path, keeps the width in path constant.
Beneficial effect of the present invention can sum up following 4 points:
(1) modularization: according to the needs in electric powered motor source, Module Division is carried out to monomer lithium ion battery, Li-ion batteries piles is formed by monomer lithium ion battery, then form lithium ion battery case by Li-ion batteries piles, be modularly designed with the debugging and maintenance that are beneficial to lithium ion battery case.
(2) integrated: main control chips all in design all adopt the 5th generation integrated circuit, i.e. SOC (system on a chip), electronic circuit integrated level is high, decreases the component number in hardware circuit, simplify the architecture of battery management system, reduce the possibility producing fault.
(3) simplify: form communication network by simple one-line point-to-point communication mode, realize the direct management to monomer lithium ion battery, monomer lithium ion battery has been got well in management, and just whole lithium ion battery case has been got well in management, makes complicated question simplification.
(4) reliability: adopt monomer lithium ion battery way to manage to decrease impedance, reduce parasitic capacitance, stray inductance, ensure that the accuracy of image data, reliability; Adopt one-line point-to-point communication mode, the communication network of battery management system is cut the garment according to the figure, utilize the advantage of monomer lithium ion battery and Li-ion batteries piles its voltage, the network system of lithium ion battery case internal network systems and automotive electronics outside is kept apart, the validity of network system organization, reasonability are accomplished, decrease the signal disturbing between connection and electromagnetic interference, enhance the antijamming capability of battery management system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail
Fig. 1 is lithium ion battery box structure composition diagram
Fig. 2 is lithium ion battery case network connection layout
Fig. 3 is lithium ion battery case master control borad functional structure chart
Fig. 4 is Li-ion batteries piles structure composition diagram
Fig. 5 is lithium ion battery group network connection layout
Fig. 6 is Li-ion batteries piles control board functional structure chart
Fig. 7 is monomer lithium ion battery data acquisition unit functional structure chart
Fig. 8 is the inner charge and discharge connection layout of lithium ion battery management system
Fig. 9 is the one-line communications protocol of lithium ion battery management system
Figure 10 is lithium ion battery management system electric current, tension measuring circuit
Figure 11 is lithium ion battery management system temperature measuring circuit
Figure 12 is relation between lithium ion battery management system battery remaining power and cell voltage, battery current, battery temperature three
Figure 13 is the structural model of lithium ion battery
Figure 14 is lithium ion battery management system battery voltage measurement flow chart
Figure 15 is lithium ion battery management system battery current measurement procedure figure
Figure 16 is lithium ion battery management system battery temperature measurement procedure figure
Figure 17 is lithium ion battery management system battery remaining power measurement procedure figure
In Fig. 1
represent the number X of the Li-ion batteries piles of connecting in lithium ion battery case,
represent Li-ion batteries piles parallel connection label successively, wherein, Y represents the number of the Li-ion batteries piles that synchronous serial connects in lithium ion battery case,---represent the connecting line that lithium ion battery case is connected with the point-to-point synchronous serial of Li-ion batteries piles.
In Fig. 2
represent lithium ion battery case to be connected by one-line communication bus network with Li-ion batteries piles, the network system between the lithium ion battery case be made up of the one-line communication bus of n=X+Y bar and Li-ion batteries piles.
In Fig. 3
the exchanges data that the SOC (system on a chip) representing each funtion part of lithium ion battery case master control borad and lithium ion battery case master control borad is carried out, wherein, the hardware components of n=X+Y one-line communication bus.
In Fig. 4
represent the number M of the monomer lithium ion battery of connecting in Li-ion batteries piles,
represent monomer lithium ion parallel connection label successively, wherein, N represents the number of monomer lithium ion battery in parallel in Li-ion batteries piles,---represent the connecting line that Li-ion batteries piles is connected with the point-to-point asynchronous serial of monomer lithium ion battery.
In Fig. 5
represent Li-ion batteries piles to be connected by one-line communication bus network with monomer lithium ion battery, the network system between the Li-ion batteries piles be made up of the one-line communication bus of n=M+N bar and monomer lithium ion battery.
In Fig. 6
the exchanges data that the SOC (system on a chip) representing each funtion part of Li-ion batteries piles control board and Li-ion batteries piles control board is carried out, wherein, need the part of protection to divide into groups monomer lithium ion battery, the control board of Li-ion batteries piles bears eight tasks.
In Fig. 7
the exchanges data that the SOC (system on a chip) representing each funtion part of monomer lithium ion battery data sampling unit and monomer lithium ion battery data sampling unit is carried out; wherein; need the part of protection to divide into groups monomer lithium ion battery, monomer lithium ion battery data sampling unit bears three tasks.
In Fig. 8
when representing charge and discharge, sense of current, wherein, foreign current carries out charge and discharge by the base plate of lithium ion battery case to Li-ion batteries piles, internal current carries out discharge and recharge by the base plate of Li-ion batteries piles to monomer lithium ion battery, and the base plate of lithium ion battery case and the base plate of Li-ion batteries piles play the effect of fixing Li-ion batteries piles and monomer lithium ion battery.
In Fig. 9 → represent the Organization of Data of one-line communication in lithium ion battery management system sequentially, monomer lithium ion battery data sampling unit is connected by point-to-point asynchronous serial and the control board of Li-ion batteries piles carries out communication, the control board of Li-ion batteries piles is connected by point-to-point synchronous serial and the master control borad of lithium ion battery case carries out communication, one-line communication bus is by high speed photo coupling and monomer lithium ion data acquisition unit, Li-ion batteries piles control board, the master control borad of lithium ion battery case carries out Phototube Coupling, transmission data are by the Organization of Data order serial transmission of one-line communication bus according to regulation, data are made to have confidentiality.
Figure 10 is electric current, voltage sample module, the operating state of cell voltage and battery and internal temperature thereof and operating ambient temperature thereof have very important relation, to the precision of its sampling, antijamming capability, drift, temperature drift and the requirement of the linearity all very high, measurement data whether accurate, directly has influence on the accurate judgement to battery status.Sensor sample fast response time, has the resistance alloys of good linearity as voltage sensor.Current sample is the Main Basis estimating battery remaining power, therefore, all very high to precision of its sampling, antijamming capability, drift, temperature drift and the requirement of the linearity, relative battery module voltage measurement, the measurement more complicated of electric current, when in the face of some inductive load, electric current is pulsation, current changing rate is comparatively large, and fast response time of therefore must sampling, has the resistance alloys of good linearity as current sensor.
Figure 11 is temperature sampling module, due in charge and discharge process, monomer lithium ion battery itself can produce certain heat, thus monomer lithium ion battery temperature can be caused to rise, temperature can affect a lot of characterisitic parameters of monomer lithium ion battery, therefore to carry out thermal management to monomer lithium ion battery group be very important.Owing to requiring multimetering temperature in battery management system, each temperature meter is distributed in Battery case, the design adopted will have certain antijamming capability, according to the cost performance of temperature sensor, adopts thermistor can obtain good effect to the measurement of analog signal.Namely temperature sampling point has three places: the air themperature near Li-ion batteries piles, monomer lithium ion battery case surface temperature, and monomer lithium ion battery electrolyte inside temperature.Wherein, monomer lithium ion battery case surface temperature is positioned at above monomer lithium ion sampling unit, and the air themperature near Li-ion batteries piles is positioned at above Li-ion batteries piles control board.
Figure 12, Figure 13, Figure 14, Figure 15, Figure 16 and Figure 17 be write software based on monomer lithium ion battery parameters between correlation and the flow chart of their software simulating, Figure 12 is monomer lithium ion battery model, the internal resistance of monomer lithium ion battery includes ohmic internal resistance and polarization resistance, and the process that each internal resistance produces and being also not quite similar with the functional relation of battery remaining power, electric current, temperature, so different internal resistances separately considers it is necessary.Figure 13 mainly from the voltage of monomer lithium ion battery, electric current, temperature on the impact of monomer lithium ion battery residual capacity and their relations each other, Figure 12 is the basis realizing Figure 12, Figure 13, Figure 14, Figure 15, Figure 16, Figure 17, Figure 13 is the foundation realizing Figure 14, Figure 15, Figure 16, Figure 17, Figure 14 is monomer lithium ion battery voltage measurement flow chart, Figure 15 is monomer lithium ion battery current measurement flow chart, Figure 16 is monomer lithium ion battery temperature survey flow chart, and Figure 17 is monomer lithium ion battery residual capacity measurement procedure figure.
Embodiment
In FIG, according to the technical requirement of electric automobile, Module Division is carried out to monomer lithium ion battery, monomer lithium ion battery is by string, form in parallel carry out mechanically connect to form Li-ion batteries piles, Li-ion batteries piles is applicable to the power source doing electric bicycle, Li-ion batteries piles is by string, form in parallel carry out mechanically connect to form lithium ion battery case, lithium ion battery case is applicable to the power source making electric automobile, in FIG, the one-line communication bus of Li-ion batteries piles control board and monomer lithium ion data acquisition unit is end to end being linked in sequence, the one-line communication bus of lithium ion battery case master control borad and Li-ion batteries piles control board is equal parallel join, in fig. 2, monomer lithium ion battery makes by point-to-point asynchronous serial communication the network system forming Li-ion batteries piles inside between Li-ion batteries piles control board and monomer lithium ion battery data acquisition unit, Li-ion batteries piles makes by point-to-point synchronous serial communication the network system forming lithium ion battery case inside between the master control borad of lithium ion battery case and the control board of Li-ion batteries piles, in figure 3, the SOC (system on a chip) of lithium ion battery case and the SOC (system on a chip) of Li-ion batteries piles are main, from relation, lithium ion battery case master control borad is monitored each Li-ion batteries piles by point-to-point synchronous serial communication, management, and the exchanges data of lithium ion battery case master control borad and outside.To monomer lithium ion battery from carrying out module grouping
M is monomer lithium ion battery series connection number N is monomer lithium ion battery number in parallel
X is Li-ion batteries piles series connection number Y is Li-ion batteries piles number in parallel
M=electric bicycle power source voltage ÷ monomer lithium ion battery voltage
N=electric bicycle power source capacity ÷ monomer lithium ion battery capacity
X=electric powered motor source voltage ÷ Li-ion batteries piles voltage
Y=electric powered motor source capacity ÷ lithium ion battery pool-size
In the diagram, structure between Li-ion batteries piles and monomer lithium ion battery carries out end to end being linked in sequence by one-line communication bus, in Figure 5, when one-line communication bus controls each monomer lithium ion data acquisition unit, order sends from the control board of Li-ion batteries piles, then n-th piece of monomer lithium ion data acquisition unit is delivered to successively from first piece of monomer lithium ion data acquisition unit, receive order and be delivered to the 1st piece of monomer lithium ion data acquisition unit successively from n-th piece of monomer lithium ion data acquisition unit, then the control board of Li-ion batteries piles is got back to, the SOC (system on a chip) of Li-ion batteries piles plays leading role to whole Li-ion batteries piles, monomer lithium ion battery data acquisition unit towards be monomer lithium ion battery, the SOC (system on a chip) of Li-ion batteries piles and the SOC (system on a chip) of monomer lithium ion battery data acquisition unit are main, from relation, one-line communication is connected by point-to-point asynchronous serial and runs through whole Li-ion batteries piles, each systemic-function of Li-ion batteries piles is run through, and the SOC (system on a chip) of Li-ion batteries piles plays a key effect to the performance of whole Li-ion batteries piles and stability.In figure 6; divide from the hardware circuit of Li-ion batteries piles control board, comprising: one-line communication module, overcurrent protection module, short circuit protection module, over-voltage protection module, under-voltage protection module, reverse-voltage protection module, high temperature protection module, low-temperature protection module, battery capacity circuit module.In the figure 7, divide into groups from the hardware circuit of monomer lithium ion data sampling unit function, the hardware circuit of monomer lithium ion data acquisition unit comprises: one-line communication module, voltage balance of battery module, battery voltage measurement module, battery temperature measurement module.One-line communication module comprises the Organization of Data order of one-line communication, monomer lithium ion battery data sampling unit is connected by point-to-point asynchronous serial and the control board of Li-ion batteries piles carries out communication, the control board of Li-ion batteries piles is connected by point-to-point synchronous serial and the master control borad of lithium ion battery case carries out communication, one-line communication bus is by high speed photo coupling and monomer lithium ion data acquisition unit, Li-ion batteries piles control board, the master control borad of lithium ion battery case carries out Phototube Coupling, transmission data are by the Organization of Data order serial transmission of one-line communication bus according to regulation, data are made to have confidentiality.Electric current, voltage sample module, the operating state of cell voltage and battery and internal temperature thereof and operating ambient temperature thereof have very important relation, to the precision of its sampling, antijamming capability, drift, temperature drift and the requirement of the linearity all very high, measurement data whether accurate, directly has influence on the accurate judgement to battery status.Sensor sample fast response time, has the resistance alloys of good linearity as voltage sensor.Current sample is the Main Basis estimating battery remaining power, therefore, all very high to precision of its sampling, antijamming capability, drift, temperature drift and the requirement of the linearity, relative battery module voltage measurement, the measurement more complicated of electric current, when in the face of some inductive load, electric current is pulsation, current changing rate is comparatively large, and fast response time of therefore must sampling, has the resistance alloys of good linearity as current sensor.Due in charge and discharge process, monomer lithium ion battery itself can produce certain heat, thus monomer lithium ion battery temperature can be caused to rise, temperature can affect a lot of characterisitic parameters of monomer lithium ion battery, therefore to carry out thermal management to monomer lithium ion battery group be very important.Owing to requiring multimetering temperature in battery management system, each temperature meter is distributed in Battery case, the design adopted will have certain antijamming capability, according to the cost performance of temperature sensor, adopts thermistor can obtain good effect to the measurement of analog signal.Namely temperature sampling point has three places: the air themperature near Li-ion batteries piles, monomer lithium ion battery case surface temperature, and monomer lithium ion battery electrolyte inside temperature.Wherein, monomer lithium ion battery case surface temperature is positioned at above monomer lithium ion sampling unit, air themperature near Li-ion batteries piles is positioned at above Li-ion batteries piles control board, balance between monomer lithium ion battery is very important, the inefficacy of a lithium ion battery often affects the overall performance of whole lithium ion battery case, by realizing the balance between monomer lithium ion battery in monomer lithium ion data sampling unit installation two panels paster field effect transistor.
Claims (2)
1. the universal lithium ion battery management system in an applicable electric bicycle and electric powered motor source, it is characterized in that: employing the 5th generation integrated circuit, i.e. SOC (system on a chip), to be connected by point-to-point asynchronous serial between the data acquisition unit of monomer lithium ion battery and the control board of Li-ion batteries piles and between the control board of Li-ion batteries piles and the master control borad of lithium ion battery case, point-to-point synchronous serial is connected, realize the network system of monomer lithium ion battery being carried out to directly management, wherein, point-to-point asynchronous serial connection refers to that the data acquisition unit of monomer lithium ion battery carries out point-to-point communication by the control board of one-line communication bus and Li-ion batteries piles, the one-line bus of Li-ion batteries piles control board and monomer lithium ion data acquisition unit is end to end being linked in sequence, realize the direct management to monomer lithium ion battery, point-to-point synchronous serial connection refers to that each Li-ion batteries piles control board respectively carries an one-line communication bus, communication is carried out with the master control borad of lithium ion battery case, the one-line bus of lithium ion battery case master control borad and Li-ion batteries piles control board is equal parallel join, realizes the direct management to Li-ion batteries piles, monomer lithium ion battery data acquisition unit refers to a loading SOC (system on a chip) in monomer lithium ion battery PCB control board, then an entirety is packaged into, wherein, the hardware circuit of monomer lithium ion data acquisition unit comprises: one-line communication module, voltage balance of battery module, battery voltage measurement module, battery temperature measurement module.
2. universal lithium ion battery management system according to claim 1, it is characterized in that: universal lithium ion battery management system according to claim 1, it is characterized in that: according to the needs in electric powered motor source, Module Division is carried out to monomer lithium ion battery, Li-ion batteries piles is formed by multiple monomer lithium ion battery, Li-ion batteries piles is applicable to the power source being used as electric bicycle, lithium ion battery case is formed by multiple Li-ion batteries piles, lithium ion battery case is applicable to the power source making electric automobile, concrete formula is as follows: M is monomer lithium ion battery series connection number, N is monomer lithium ion battery number in parallel, X is Li-ion batteries piles series connection number, Y is Li-ion batteries piles number in parallel, wherein, M=electric bicycle power source voltage ÷ monomer lithium ion battery voltage, N=electric bicycle power source capacity ÷ monomer lithium ion battery capacity, X=electric powered motor source voltage ÷ Li-ion batteries piles voltage, Y=electric powered motor source capacity ÷ lithium ion battery pool-size.
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| CN103630255B (en) * | 2012-08-21 | 2016-12-21 | 中国电信股份有限公司 | Capacitance temperature to operating uninterrupted power source carries out the system of on-line monitoring |
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